David James Elliott Lt., Lt. Cmdr. Harmon "Harm" Rabb, Jr. Actor Catherine Bell Maj., Lt. Col. Sarah "Mac" MacKenzie Actor Patrick Laborteaux Lt. j.g., Lt. Bud Roberts Actor John M. Jackson Actor Morgan Hunter Guest Star Lindsey Ginter Guest Star David Warshofsky Guest Star Aleksandr Kuznetsov Guest Star Christian Hoff Guest Star Michael McKay Guest Star Heinrich James Guest Star Matthew Sutherland Guest Star Mio R. Jakula Guest Star Oleg Taktarov Guest Star Kristof Konrad Guest Star John Eric Bentley Guest Star Jon Huertas Guest Star Geoffrey Scott Brown Guest Star Timothy Troyan Guest Star Yvette Helene Guest Star Richard Kaszonyi Guest Star Donald P. Bellisario Executive Producer Tony Wharmby Director R. Scott Gemmill Writer